A hinge includes a first shaft and a second shaft that are parallel to each other, first and third arms rotatably coupled to the first shaft and including first and third rotary cams, second and fourth arms rotatably coupled to the second shaft and including second and fourth rotary cams, a first sliding part coupled to the first and second shafts to be movable along the first and second shafts and including a first sliding cam facing the first rotary cam and a second sliding cam facing the second rotary cam, a second sliding part coupled to the first and second shafts to be movable along the first and second shafts and including a third sliding cam facing the third rotary cam and a fourth sliding cam facing the fourth rotary cam, and an elastic member disposed between the first sliding part and the second sliding part.